How to is a video screen including some autonomous computing part (actually, the appropriation of a PC tablet without any communication function nor interactivity).A set of expressions and graphical symbols are displayed in a continuous and regular sequence, they are alternated by brief connectives.These terms and symbols are found in technical manuals or educational films from railways companies; however this clue is hardly perceived because although the elements are selected to be compounds of known and non-technical words or signs, the arrangement is weird and puzzling.How to is a series of works where the object and the software are always the same but the graphics, so the referential object, different each time.